Yes. Use it.
I wouldn't pin your hopes on getting a Unibody replacement. All Apple are promising is a replacement graphics chip.
The guy at the Apple Store I visited said it was free repairs for the graphics card for two years from date of purchase. I said I thought the technote here: http://support.apple.com/kb/TS2377 said three years. But I've just looked at it again and now it says "Apple will continue to evaluate the repair data and will provide further repair extensions as needed."
What does that mean? I'm not wrong am I - it did say three years at one point?
Does that mean they will go on replacing the wretched cards indefinitely?